Remove pseudo-node from LoadLocalNode and replace it with a proper AST node.

runtime/vm/ast_printer.cc

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/ast_printer.h"
 
 #include "vm/handles.h"
 #include "vm/object.h"
 #include "vm/os.h"
 #include "vm/parser.h"
@@ skipping 20 matching lines @@
   ASSERT(node_sequence != NULL);
   for (int i = 0; i < node_sequence->length(); i++) {
     OS::Print("scope %p: ",
               node_sequence->scope());
     node_sequence->NodeAt(i)->Visit(this);
     OS::Print("\n");
   }
 }
 
 
+void AstPrinter::VisitCommaNode(CommaNode* node) {
+  VisitGenericAstNode(node);
+}
+
+
 void AstPrinter::VisitCloneContextNode(CloneContextNode* node) {
   VisitGenericAstNode(node);
 }
 
 
 void AstPrinter::VisitArgumentListNode(ArgumentListNode* arguments) {
   VisitGenericAstNode(arguments);
 }
 
 
@@ skipping 442 matching lines @@
   ASSERT(node_sequence != NULL);
   AstPrinter ast_printer;
   const char* function_name =
       parsed_function.function().ToFullyQualifiedCString();
   OS::Print("Ast for function '%s' {\n", function_name);
   node_sequence->Visit(&ast_printer);
   OS::Print("}\n");
 }
 
 }  // namespace dart